title: Essential role of stress hormone signaling in cardiomyocytes for the prevention of heart disease.
abstract: Heart failure is a leading cause of death in humans, and stress is increasingly associated with adverse cardiac outcomes. Glucocorticoids are primary stress hormones, but their direct role in cardiovascular health and disease is poorly understood. To determine the in vivo function of glucocorticoid signaling in the heart, we generated mice with cardiomyocyte-specific deletion of the glucocorticoid receptor (GR). These mice are born at the expected Mendelian ratio, but die prematurely from spontaneous cardiovascular disease. By 3 mo of age, mice deficient in cardiomyocyte GR display a marked reduction in left ventricular systolic function, as evidenced by decreases in ejection fraction and fractional shortening. Heart weight and left ventricular mass are elevated, and histology revealed cardiac hypertrophy without fibrosis. Removal of endogenous glucocorticoids and mineralocorticoids neither augmented nor lessened the hypertrophic response. Global gene expression analysis of knockout hearts before pathology onset revealed aberrant regulation of a large cohort of genes associated with cardiovascular disease as well as unique disease genes associated with inflammatory processes. Genes important for maintaining cardiac contractility, repressing cardiac hypertrophy, promoting cardiomyocyte survival, and inhibiting inflammation had decreased expression in the GR-deficient hearts. These findings demonstrate that a deficiency in cardiomyocyte glucocorticoid signaling leads to spontaneous cardiac hypertrophy, heart failure, and death, revealing an obligate role for GR in maintaining normal cardiovascular function. Moreover, our findings suggest that selective activation of cardiomyocyte GR may represent an approach for the prevention of heart disease.
authors.affiliation: Laboratory of Signal Transduction, Comparative Medicine Branch, and Cellular and Molecular Pathology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709.
authors.forename: Robert H
authors.initials: RH
authors.lastname: Oakley
authors.forename: Rongqin
authors.initials: R
authors.lastname: Ren
authors.forename: Diana
authors.initials: D
authors.lastname: Cruz-Topete
authors.forename: Gary S
authors.initials: GS
authors.lastname: Bird
authors.forename: Page H
authors.initials: PH
authors.lastname: Myers
authors.forename: Michael C
authors.initials: MC
authors.lastname: Boyle
authors.forename: Michael D
authors.initials: MD
authors.lastname: Schneider
authors.forename: Monte S
authors.initials: MS
authors.lastname: Willis
authors.forename: John A
authors.initials: JA
authors.lastname: Cidlowski
mesh_terms: D000375:Aging / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D000818:Animals; D006332:Cardiomegaly / Q000235:genetics / Q000378:metabolism* / Q000473:pathology / Q000517:prevention & control*; D002470:Cell Survival; D005938:Glucocorticoids / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D008901:Mineralocorticoids / Q000235:genetics / Q000378:metabolism*; D009206:Myocardium / Q000378:metabolism* / Q000473:pathology; D032383:Myocytes, Cardiac / Q000378:metabolism / Q000473:pathology; D009928:Organ Specificity / Q000235:genetics; D011965:Receptors, Glucocorticoid / Q000235:genetics / Q000378:metabolism* / Q000502:physiology*; D015398:Signal Transduction
chemical_list: D005938:Glucocorticoids; D008901:Mineralocorticoids; D011965:Receptors, Glucocorticoid